I've experimented with visualizations, and if there are docs, tips and tricks to visualizations, I haven't stumbled upon them yet (see bottom of this message). So, far, it seems like a complex substitute for the straightforward HTML mode that has been devolved.
While it seems possible to show the same text and cover art and spectrum analyzer (or whatever), it doesn't look as good and is a challenge to position everything cleanly. By default cover art/images are much lower resolution than the originals, fonts are fuzzy, etc. When the same images and text is shown via HTML everything is always sharp and clean. The resolution graphic visualization problem can be improved by clicking Display Quality > Highest Quality (default Normal is what looks fuzzy) -- but this setting took a while to discover.
The problem was that many Playback display settings (such as Display Quality) are only available while a track is playing. When not playing, the settings aren't grayed-out, they just disappear, so there's no clue they exist. Why not provide access all the time, via Options > Play > Display, to ALL the Play mode settings, instead of having them scattered around and appearing only some of the time? Play settings seem just as important as the other things on the Options menu -- more important than many.
Even finding Visualization Studio is tricky; the link to it doesn't seem to appear on a menu unless a track is actually playing and showing a visualization. Then Visualization Studio shows up under Display Options -- but disappears the instant the track stops playing. I think it's actually an Advanced Tool and should *always* be on that menu.
Side Note: MC15 > Tools > Plug-In Manager > Download Plug-Ins goes to a web page that does not explicitly list ANY MC15 Plug-Ins. The page begins with "1. Before You Start Choose: Media Center Version" but the newest version listed is 14.0. I know most MC14 Plug-Ins work with MC15, but there's no evidence of this. And with the devolution of MC15.0.87, some of the visualizations no longer work correctly because they are HTML plus embedded COM visualization. Seems someone needs to review all and mark for MC15 only those that still work as intended; a quick look suggests most of the 28 Track Info Plug-Ins are now obsolete.
Searching the wiki, this seems to be the entire docs of Visualization Studio at
http://wiki.jrmediacenter.com/index.php/Visualization_StudioTo access Visualization Studio, you must be displaying a visualization in the Playing Now Display Pane. Right-click in the pane and select Visualization Studio.
A Visualization is composed of a variety of components that you can add, customize, or remove. Visualization Studio includes: flush, Super Transform, Transform, Blob Oscilloscope, Dot Fountain, Image, Oscilloscope, Particle, Spectrum Analyzer, Starfield, Super-Scope, Text and Layer.
If you play around with these and their settings, you can come up with some pretty nifty visualizations!
...a tad light on details.
The visualization studio files (.mjv) are actually text wrapped in tags, so they can be edited outside of Visualization Studio, IF documented.
I am seriously considering reverting my playback PC back to MC 15.0.80 -- a horrible workaround but losing the coolest display of ANY media player is hard to accept. I value a Play screen packed with useful information -- everyone (about 60 symphony musicians and friends were listening to my MC yesterday) who sees my system LOVES seeing title, artist, year, chart position, album, composer, artist comments, performance comments, recording comments, etc -- much of it from custom fields -- plus cover art/image, plus dynamic display of the audio (Stereo Spectrum Analyzer). People will literally gather around the screen, or dash back to it every time an interesting song starts. As a test I've shown people the other visualizations -- bouncing icons and psychedelic colors -- and it's boring because it offers no value. This is why I carefully crafted an HTML+COM page. In my situation, for music playback MC15 is now LESS useful than MC14 or even MC13.